Stygimoloch

Stygimoloch:

Stygimoloch was a dome-headed dinosaurs, Stygimoloch , Dracorex and Pachycephalosaurus may be different growth stages of the same species in which the bumps hooks and knobs on the skull were gradually replaced by a dome of solid bone. A fully formed dome may have been a way of saying to other dinosaurs i am now a mature adult who is strong enough to defend my territory